The Audemars Piguet Royal Oak Perpetual Calendar 26574 is the current-generation ultra-thin perpetual calendar built into the standard 41 mm Royal Oak case, showing day, date, month, leap year and moon phase without needing correction until the year 2100. This guide covers the complication, how the 26574 compares with the smaller 26586 and with the original 5548 that introduced the perpetual calendar Royal Oak in the 1980s, case material options, current price context and what to check before buying. Bizak sources the 26574 to order; the Royal Oak collection lists the configurations we can seek.
Last reviewed on September 26, 2026 by Filip Biczak. Prices are dated observations, not quotes.
Royal Oak Perpetual Calendar 26574 specifications
| Attribute | 26574 |
|---|---|
| Case | 41 mm, offered in stainless steel, ceramic and precious metal, octagonal bezel, integrated bracelet |
| Complication | Perpetual calendar: day, date, month, leap year cycle, moon phase |
| Movement | Automatic, ultra-thin perpetual calendar calibre |
| Dial | Grande Tapisserie pattern with subdial layout for day, month, leap year indicator and moon phase; date at the outer edge |
| Crystal | Sapphire, both sides |
| Bracelet | Integrated Royal Oak bracelet in matching material, folding clasp |
| Correction needed until | The year 2100, when the calendar will require a manual correction as it does not account for that century's leap-year exception |
Source: Audemars Piguet, watch collection, which lists current Royal Oak Perpetual Calendar configurations.
What is a perpetual calendar, and why does it matter here?
A perpetual calendar mechanically tracks the varying lengths of months, including February's 28 or 29 days, and the leap-year cycle, so the date display corrects itself automatically without the wearer resetting it each month, unlike a simple date or even an annual calendar. What makes the Royal Oak's version notable is that AP builds this complication, traditionally one of the thicker mechanical constructions in watchmaking, into a case barely thicker than the standard three-hand Selfwinding. That thinness is the core engineering achievement AP markets around this reference, alongside the moon phase and leap-year indicators shown on the dial.
26574 versus 26586: which size?
| 26574 | 26586 | |
|---|---|---|
| Case | 41 mm | Smaller diameter, generally in the high 30s to low 40s mm range depending on the specific reference |
| Complication | Same perpetual calendar function | Same perpetual calendar function |
| Wearing character | The mainstream current size, suits most wrists | A more compact alternative for smaller wrists or those who prefer a slimmer visual footprint |
Both share the same calendar mechanism and moon phase; the choice between them is almost entirely about case size and how the watch sits on a specific wrist, since AP does not differentiate the complication itself between the two.
How does the current 26574 compare with the original 5548?
Audemars Piguet introduced the first Royal Oak perpetual calendar, reference 5548, in the early 1980s, notable then for being among the thinnest automatic perpetual calendars available in a steel sports-watch case. The current 26574 carries the same design intent forward: a genuinely thin case despite the complication, a moon phase, and a dial legible enough to read the calendar functions at a glance. Case proportions, movement architecture and finishing have all been updated across the decades between the two references, but the core idea, an ultra-thin perpetual calendar in the Royal Oak's octagonal case, has been consistent since the 1980s reference established it.
Bizak's sourced catalogue: Royal Oak Perpetual Calendar prices
- White gold, blue dial. On 26 September 2026 our sourced catalogue listed a 26574BC.OO.1220BC.02 white gold Perpetual Calendar at US$351,230 brand new, sourced to order.
That figure describes what we saw on the date given and will move with each new intake. Ask for a dated quote for the exact reference, material and set; precious-metal complicated Royal Oaks vary considerably by dial, case material and rarity.
Materials available for the Perpetual Calendar
The 26574 has been offered in stainless steel, ceramic and precious metals including rose, yellow and white gold, with a steel version generally the most attainable entry point into the reference and precious-metal or ceramic versions commanding a substantial premium. Ceramic versions add scratch resistance over steel or gold at the cost of the metal's traditional lustre and, like other ceramic Royal Oak cases, cannot be polished if chipped. Buyers choosing between materials should weigh everyday durability against the more formal presence precious metal gives a dress-leaning complication like a perpetual calendar.
How does the moon phase work, and how accurate is it?
The moon phase display tracks the roughly 29.5-day lunar cycle using a gear ratio that approximates the true cycle closely but not perfectly; most mechanical moon phase mechanisms drift by about one day every few years and need an occasional manual correction, distinct from the perpetual calendar's own automatic date correction. AP's execution on the 26574 places the moon phase within the broader calendar subdial layout rather than as an isolated aperture, keeping the dial legible despite the number of functions displayed. Buyers should understand the moon phase and the perpetual calendar as two related but separately adjusted functions, both operated through the case-side correctors.
How does the 26574 wear compared with the standard Selfwinding?
Despite the added complication, the 26574 is close in thickness to the standard three-hand Royal Oak Selfwinding, a direct result of AP's ultra-thin perpetual calendar movement architecture. On the wrist it reads as a Royal Oak first and a complicated watch second, without the pronounced extra case height that perpetual calendars often carry in other manufacturers' round cases. This makes it a genuinely wearable complicated watch rather than a display piece too thick for regular use, which is a meaningful part of its appeal against complicated watches from other houses.
Is the Royal Oak Perpetual Calendar a good investment?
Treat it as a watch to own and wear rather than a financial instrument. Complicated Royal Oaks generally move on rarity, dial configuration and material rather than the broader steel-sport-watch sentiment that drives the standard Selfwinding's resale. A perpetual calendar's mechanical complexity and the smaller number of specialists able to service it both support long-term value, but pricing a specific example requires comparing it against recent asks for the same reference and material rather than assuming a fixed premium. Buy the material and dial you actually want; if resale matters, ask for a written cash-buy assessment before you commit.
Buying a Royal Oak Perpetual Calendar: what to check
- Calendar accuracy. Confirm the day, date, month, leap year indicator and moon phase are all correctly synchronised; a calendar showing the wrong information may need a watchmaker's correction, which on a perpetual calendar can be more involved than on a simple date.
- Correctors. Perpetual calendars are typically adjusted through small recessed correctors in the case side rather than the crown; check that these are present, unmarred and functioning.
- Reference and dial match. Confirm the full reference number, including material and dial suffix, against the case back and dial print.
- Bracelet stretch. The integrated bracelet is expensive to service; hold the watch by the clasp and look for sag between links.
- Warranty card and serial. The engraved case serial should match any accompanying card; AP does not reissue cards for lost paperwork.
- Movement service history and specialist access. A perpetual calendar service is more specialised than a three-hand watch's; ask for the last service date and receipt. AP's service information page outlines what a factory service covers.
- Price against recent asks. Compare any offer against recent asks for the same reference, material and dial rather than a general Royal Oak price band, since complicated pieces vary more individually than three-hand watches.
Our authentication process describes what we inspect before dispatch, and our Royal Oak authentication and collecting guide goes deeper on case and reference checks.
Quick answers
What does the Royal Oak Perpetual Calendar 26574 show on the dial?
Day, date, month, a leap-year cycle indicator and a moon phase, all mechanically tracked so the calendar corrects itself automatically without needing to be reset each month.
How much does a Royal Oak Perpetual Calendar cost?
Bizak's sourced catalogue listed a white gold 26574 at US$351,230 brand new, sourced to order, on 26 September 2026; steel versions, where available, generally sit well below precious-metal examples.
What is the difference between the 26574 and the 26586?
Both use the same perpetual calendar movement and moon phase; the 26586 is offered in a smaller case diameter, making it the choice for buyers who prefer a more compact watch.
When will the Royal Oak Perpetual Calendar need manual correction?
Not until the year 2100, when the calendar's leap-year mechanism will require a one-time manual adjustment because it does not account for that century's exception to the usual leap-year rule.
Is the Royal Oak Perpetual Calendar hard to service?
It is more specialised than a three-hand watch, given the number of interlinked calendar components, and is best serviced by Audemars Piguet or a watchmaker experienced with perpetual calendars.
Request a Royal Oak Perpetual Calendar sourcing quote
Tell us the reference, case material and dial you want, plus your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs, papers and final price before you commit. Browse the Royal Oak collection, the wider Audemars Piguet collection, or sell or trade your Royal Oak.
Related reading: Audemars Piguet price guide · Royal Oak authentication and collecting guide · Patek Philippe Nautilus 5740 guide · Richard Mille price guide.
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